Candle barely scents the room when lit
Weak hot throw is the single most common complaint in candle making. It usually means the flame is not melting enough wax to release fragrance, or the fragrance was destroyed at pour.
Why this happens
Hot throw is fragrance vaporised out of a full melt pool. Undersized wicks give shallow pools that never reach the vaporisation temperature of the heavier notes. Fragrance added above its flash point in the pot is destroyed before it ever gets in the vessel.
Likely causes
- Wick is under-sized; melt pool too shallow to vaporise FO.
- Fragrance added while the wax was hotter than the supplier's recommended addition temperature, driving off top notes.
- Insufficient cure time (soy candles need 7–14 days).
- Fragrance load below the wax's effective minimum (typically 6%).
How to diagnose
- Confirm melt pool reaches the vessel wall within 2 hours.
- Compare the temperature at which fragrance was added against the wax and FO supplier's recommended addition range. Flash point is a fire-safety property, not a pour cap.
- Measure cure time: was the candle burned before day 7?
Change sheet · next batch
Fill in what you know. The change sheet below re-orders so the delta most likely to help your specific batch floats to the top.
Deeper, wider pool releases more fragrance per hour.
Wax needs to fully bind the FO before it releases cleanly.
Above 80°C many oils lose top and mid notes.
Increase load only after wick and cure are correct.
Take action
- Candle smells weak in the jar before lighting
Cold throw is muted, no scent at counter.
- Candle tunnels down the centre
Wax left on the wall, narrow burn pool.
- Fragrance fades after a few weeks
Strong at week 1, weak at week 6.
- Fragrance load and IFRA: why your max load varies
IFRA category 12 caps candle fragrance load. Here's what the standard says, and why exceeding wax max backfires.